Bump liberty, make use of its new asciiman.awk

CMakeLists.txt

@@ -234,7 +234,8 @@ install (DIRECTORY plugins/xC/
 find_program (ASCIIDOCTOR_EXECUTABLE asciidoctor)
 find_program (A2X_EXECUTABLE a2x)
 if (NOT ASCIIDOCTOR_EXECUTABLE AND NOT A2X_EXECUTABLE)
-	message (FATAL_ERROR "Neither asciidoctor nor a2x were found")
+	message (WARNING "Neither asciidoctor nor a2x were found, "
+		"falling back to a substandard manual page generator")
 endif ()
 
 foreach (page xB xC xD)
@@ -256,6 +257,13 @@ foreach (page xB xC xD)
 				"${PROJECT_SOURCE_DIR}/${page}.adoc"
 			DEPENDS ${page}.adoc
 			COMMENT "Generating man page for ${page}" VERBATIM)
+	else ()
+		set (ASCIIMAN ${PROJECT_SOURCE_DIR}/liberty/tools/asciiman.awk)
+		add_custom_command (OUTPUT ${page_output}
+			COMMAND env LC_ALL=C awk -f ${ASCIIMAN}
+				"${PROJECT_SOURCE_DIR}/${page}.adoc" > ${page_output}
+			DEPENDS ${page}.adoc ${ASCIIMAN}
+			COMMENT "Generating man page for ${page}" VERBATIM)
 	endif ()
 endforeach ()